linux-kernel - Re: [PATCH v4 1/1] exec: seal system mappings

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Message-ID: <20250117101428.10714-A-hca@linux.ibm.com>
Date: Fri, 17 Jan 2025 11:14:28 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: Kees Cook <kees@...nel.org>
Cc: Christoph Hellwig <hch@....de>,
        Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
        Jeff Xu <jeffxu@...omium.org>, akpm@...ux-foundation.org,
        jannh@...gle.com, torvalds@...ux-foundation.org,
        adhemerval.zanella@...aro.org, oleg@...hat.com,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        linux-mm@...ck.org, jorgelo@...omium.org, sroettger@...gle.com,
        ojeda@...nel.org, adobriyan@...il.com, anna-maria@...utronix.de,
        mark.rutland@....com, linus.walleij@...aro.org, Jason@...c4.com,
        deller@....de, rdunlap@...radead.org, davem@...emloft.net,
        peterx@...hat.com, f.fainelli@...il.com, gerg@...nel.org,
        dave.hansen@...ux.intel.com, mingo@...nel.org, ardb@...nel.org,
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        Vlastimil Babka <vbabka@...e.cz>, Andrei Vagin <avagin@...il.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Mike Rapoport <mike.rapoport@...il.com>,
        Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>,
        Benjamin Berg <benjamin@...solutions.net>
Subject: Re: [PATCH v4 1/1] exec: seal system mappings

Hi Kees,

On Thu, Jan 16, 2025 at 11:40:37AM -0800, Kees Cook wrote:
> On Thu, Jan 16, 2025 at 06:26:55AM +0100, Christoph Hellwig wrote:
> > On Wed, Jan 15, 2025 at 03:52:23PM -0800, Kees Cook wrote:
> > > > You seem to be saying you're pushing an internal feature on upstream and
> > > > only care about internal use cases, this is not how upstream works, as
> > > > Matthew alludes to.
> > > 
> > > Internal? No. Chrome OS and Android. Linux runs more Android devices
> > > than everything else in the world combined -- this is not some random
> > > experiment.
> > 
> > All of which are tightly controlled by Google and not actually open
> > to users.  Which doesn't say they don't matter, but they matter a
> > lot less than fetures widely useful to the open not locked down
> > userbase of classic Linux.
> 
> I get your point. Though in my proposal it would be available to anyone
> without CRIU too, which is, for example, defconfig builds (excepting
> s390 and riscv).

Just looking from time to time into this discussion, so I didn't
follow everything. What makes s390 and riscv special here?